When I hear to inofficial sources, we will have an update to Plesk 7.5.3 in mid-april, which will contain several bugfixes and Horde 3 - IMP 4. Mysql 4.1 is planned in the timeframe of may-june 2005, so that's the reason I deceided to upgrade to mysql 4 using ART's channel. As I said, this is not official, just "heard" it from somewhere... I guess this will be Plesk 8, which was planned for mid-2005.

The official response from Plesk Support about Mysql-4 is:

"We base our support on the components that come with the standard install of the operating system".